for (String moduleName : outputModules.getModuleNames().values()) {
                Path subdir = test;
                if (isModuleHierarchy) {
                    // If module hierarchy is used, the directory names shall be the module names.
                    Path path = test.resolve(moduleName);
                    if (!Files.isDirectory(path)) {
                        // Main module without tests. It is okay.

                  @Override
                  protected Set<String> create(String[] elements) {
                    checkArgument(elements.length == 3);
                    // Put the sets in different orders for the hell of it
                    return Sets.union(
                        Sets.newLinkedHashSet(asList(elements)),
                        Sets.newLinkedHashSet(asList(elements[1], elements[0], elements[2])));
                  }

            for (String moduleName : outputModules.getModuleNames().values()) {
                Path subdir = test;
                if (isModuleHierarchy) {
                    // If module hierarchy is used, the directory names shall be the module names.
                    Path path = test.resolve(moduleName);
                    if (!Files.isDirectory(path)) {
                        // Main module without tests. It is okay.

      fail();
    } catch (IllegalArgumentException expected) {
    }
  }

  /**
   * If there's a bug in builder growth, we wouldn't know how to expose it. So, brute force the hell
   * out of it for a while and see what happens.
   */
  public void testBuilder_bruteForce() {
    for (int i = 0; i < reduceIterationsIfGwt(100); i++) {